c++: Remove some gratuitous typedefing

[Nathan Sidwell]

This is C++, we don't need 'typedef struct foo foo;'. Oh, and bool
bitfields are a thing.

         gcc/cp/
         * name-lookup.h (typedef cxx_binding): Delete tdef.
         (typedef cp_binding_level): Likewise.
         (struct cxx_binding): Flags are bools.

pushing to trunk

nathan
-- 
Nathan Sidwell
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